A method for controlling a washing machine is provided. An opening is formed through the semiconductor material from an upper surface to the contact pad, the opening forming an edge at or near the upper surface. During a write operation, only the NMOS transistor of a selected one of the CMOS transmission gates is turned on, and the PMOS transistor of the selected CMOS transmission gate and the PMOS and NMOS transistors of all of the CMOS transmission gates except the selected one are all turned off. The client sends a request to the WGPS to access a service provided by a site in the garden.